CONTENTS Warranty Start-Up Procedure Installation Requirements Maintenance Trouble Shooting Electrical Service Components and Controls

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2 Warranty Safety Warnings Checking the Equipment Codes Installation Requirements Location Drain Pan Requirements Clearances Mounting Water Connections Tank Construction Relief Valve Thermal Expansion Cathodic Protection Electrical Service Electrical Connection Wire Sizing Fusing Electrical Connection Jacket Assembly Standard and Optional Controls...10 Components and Controls Terminal Block Fuses and Fuse Blocks Contactors Transformer Immersion Thermostat Temperature Regulation Risk of Scald Warnings Temperature Control Sequencer...14 Display Temperature Adjustment Error Messages Temperature Limit Control Immersion Heating Elements Safety Door Lock Low Water Cut-Off Low Water Pressure Switch High Water Pressure Switch Manual Limiting Switches Time Clock Pilot Lights Alarm Bell CONTENTS Start-Up Procedure Filling the Water Heater Start-Up Checks Shutdown Procedure Maintenance T&P Relief Valve Water Chemistry Flushing the Tank Sediment Removal Scale Removal - Elements Trouble Shooting Not Enough Hot Water Water Is Too Hot Water Heater Sounds Leakage

3 FIG. 1 Front View Vertical Round Models FIG. 2 Front View Vertical Square Models FIG. 3 Front View Horizontal Models 3

4 OWNER WARNING The information contained in this manual is intended for use by qualified professional installers, service technicians or the electric utility. Consult your local expert for proper installation or service procedures. IMPORTANT: Consult and follow local Electrical Codes, Building and Fire Regulations and other Safety Codes that apply to this installation. Consult local codes officials and electric utility company to authorize and inspect all field installed electrical connections. CAUTION: Be sure to turn off power when working on or near the electrical system of the water heater. Never touch electrical components with wet hands or when standing in water. When replacing fuses, always use the correct size for the circuit. Do not test electrical system before the water heater is completely filled with water. Follow the start-up procedure. WARNING: To minimize the possibility of serious personal injury, fire or damage to your appliance, never violate the following safety rules. 1. Always keep the area around your appliance free of combustible materials, gasoline, and other flammable liquids and vapors. 2. Never cover your appliance, lean anything against it, store trash or debris near it, stand on it or in any way block the access to your appliance. CODES The equipment shall be installed in accordance with those installation regulations in force in the local area where the installation is to be made. These shall be carefully followed in all cases. Authorities having jurisdiction shall be consulted before installations are made. In the absence of such requirements, the installation shall conform to the latest edition of the National Electrical Code, NFPA 70. When the appliance is installed in Canada, it must conform to the CAE C22.1, Canadian Electrical Code, Part 1 and/or local Electrical Codes. APPROVALS This complete appliance is design certified and Listed by Underwriters Laboratories as a commercial storage electric water heater. This water heater bears the UL certification for the United States as tested under the Standard for Electric Booster and Commercial Storage Tank Water Heaters, UL1453 and C-UL in Canada as tested under the Standard for Construction and Test of Electric Storage Tank Water Heaters, CAN/CSA-C22.2 No. 110-M90. All water heater storage tanks conform to the latest edition of the ASME Boiler and Pressure Vessel Code, Section IV. INSTALLATION PROCEDURE LOCATION OF UNIT 1. Locate the appliance so that if water connections should leak, water damage will not occur. When such locations cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the unit. Under no circumstances is the manufacturer to be held responsible for water damage in connection with this unit, or any of its components. 2. Insure that the appliance is located near an acceptable drain so that the vessel can be properly drained when performing service or maintenance. The drain must also provide adequate drainage in the event of leakage the tank or related piping. The drain must prevent water damage to the adjacent area and lower floors of the structure. 4

5 3. The appliance must be installed so that the electrical components are protected from water (dripping, spraying, etc.) during appliance operation and service (replacing of fuses, elements, etc.) 4. Appliances located in a garage or parking structure shall be installed so that the jacket and all piping shall be located or protected so that it is not subject to physical damage by a moving vehicle. 5. The appliance must be installed on a level floor. Shim the base as necessary if leveling is required. 6. The floor on which the appliance is installed must be capable of supporting the total weight of the water heater when completely filled with water. Combustible floor locations may be used. Maintain required clearances from combustible surfaces. 7. The appliance must not be installed on carpet. 8. The appliance must be installed indoors where it is protected from exposure to wind, rain and weather. 9. Locate the appliance as close as possible to the point of major hot water usage, the water piping and branch electrical circuit wiring. 10. Insulate water piping to control heat loss and possible condensation. Drain Pan on Horizontal Models and Vertical Square Models 1250 Gallons and Larger The lower pan of the horizontal water heater jacket or vertical square water heater jacket is specially constructed to function as a drain pan. A water discharge opening is located in either end of the pan. The discharge opening(s) used must be piped to a suitable floor drain. If only one discharge opening in the jacket pan is piped to a floor drain, the unused opening must be plugged. This jacket pan provides an extra margin of protection against water damage on vertical square or horizontally constructed models. CAUTION: This water heater, as well as all water heaters will eventually leak. Installation of the water heater should be accomplished in such a manner that if the tank, piping or any connections should leak, the flow of water will not cause damage to the structure. For this reason, it is not advisable to install the water heater in an attic or upper floor. When such locations can not be avoided, a suitable drain pan must be installed under the water heater. Drain pans may be fabricated or purchased from your plumbing wholesaler. The drain pan must be piped to an adequate drain. Under no circumstances is the manufacturer to be held liable for any water damage in connection with this water heater. 11. The appliance must be located in an area that is not subject to freezing. The ambient temperature of the space where the appliance is installed must not go below 32 F (0 C) or above 104 F (40 C). 5

6 CLEARANCES FROM COMBUSTIBLE CONSTRUCTION 12" 12" 6" 6" 36" 36" FIG. 4 Clearances from Combustible Construction FIG. 5 Clearances from Combustible Construction 12" 6" FIG. 6 Clearances from Combustible Construction TABLE A CLEARANCES FROM COMBUSTIBLE CONSTRUCTION Right Side - 6" (15cm) (24" (0.61m) for high kw vertical square models with an additional control panel on right side) Rear - 0" Left Side - 0" Front - 36" (0.91m) for service access to controls and heating elements Top - 12" (30cm) for service access to electrical service, water connections and piping Water Pipes - 1" (25.4mm) 6

7 Maintain minimum specified clearances for adequate operation. All installations must allow sufficient space for servicing the electrical components, water pipe connections, piping and other auxiliary equipment, as well as the appliance. HOT WATER OUTLET TEMPERATURE & PRESSURE RELIEF VALVE Multiple appliances may be installed in a modular water heater installation. Multiple appliances may be installed side by side with minimum clearance between the sides of adjacent appliances because no service access is required from the sides on most models. Note that high kw input vertical square water heaters may have an additional control access panel located on the right side of the jacket requiring an additional service access from the right side. MOUNTING The water heater should be mounted to the floor following applicable architectural and local code requirements or accepted standards for the specific site and model purchased. In areas prone to seismic activity, it is recommended that the water heater be mounted to the floor according to recommended procedures for the site. In some geographic areas, additional strapping or braces may be required, consult local codes for specific requirements. Proper mounting will help to make the water heater less susceptible to seismic damage. WATER CONNECTIONS WATER CONNECTIONS HANDHOLE CLEANOUT DRAIN COLD WATER INLET FIG. 7 Water Connections- Vertical Round Models TEMPERATURE & PRESSURE RELIEF VALVE HOT WATER OUTLET COLD WATER INLET DRAIN PAN CONNECTION FIG. 8 Water Connections- Vertical Square Models HOT WATER OUTLET TEMPERATURE & PRESSURE RELIEF VALVE MANWAY (OPTIONAL) COLD WATER INLET DRAIN FIG. 9 Water Connections- Horizontal Models 7

8 NOTE: Before making any connections to the cold water inlet or hot water outlet, insure that all piping is clean and free of material or scale. This can usually be accomplished by blowing out the pipe. Any foreign material or scale entering the water heater can adversely affect operation and performance. NOTE: When using copper tubing, solder tubing to an adapter before attaching to the threaded nipple connection provided on the water heater. Soldering directly to the threaded connection may harm a lining in the nipple or damage the tank lining. Inlet and Outlet Connections For ease of service, install unions on the cold water inlet and hot water outlet of the water heater. The cold water inlet connection is located on the lower right side of the water heater. A manual shutoff valve should be installed upstream on the cold water source as an isolation device. The hot water outlet connection is located on the top center of the water heater. A manual shutoff valve should be installed downstream on the hot water outlet source as an isolation device in case the water heater must be disconnected from the system. STORAGE TANK This appliance uses a glass lined steel tank to store the heated water for use. The storage tank is constructed in accordance with the ASME Boiler and Pressure Vessel Code requirements, stamped and registered with the National Board of Boiler and Pressure Vessel Inspectors. The tank is furnished with threaded connections for cold water inlet, hot water outlet, a relief valve and a drain connection. The storage tank has a hand hole for ease of inspection, cleanout and service. An optional manhole may be specified for greater ease of inspection. The interior of the storage tank is glass lined and fired to 1600 F (871 C) to insure a molecular fusing of glass and steel to protect the steel base metal against corrosion. A magnesium anode(s) is standard to help prevent dissipation of the tank material by electrolytic action. RELIEF VALVE This water heater is supplied with a temperature and pressure relief valve(s) sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV. Some water heaters may be supplied with an optional pressure only relief valve. The relief valve(s) is installed in the vertical position and mounted in the tapping provided in the storage tank. No valve is to be placed between the relief valve and the water heater. To prevent water damage, the discharge from the relief valve must be piped to a suitable floor drain for disposal when relief occurs. No reducing couplings or other restrictions shall be installed in the discharge line. The discharge line shall allow complete drainage of the valve and line. Relief valves should be manually operated at least once a year. A relief valve that fails to completely reseat and continues to discharge water must be immediately replaced with a new, properly sized, temperature and pressure relief valve. CAUTION: Avoid contact with hot discharge water. Insure that no one is in front of or around the relief valve discharge line. Make sure that the extremely hot water manually discharged from the relief valve will not cause bodily injury or property damage. THERMAL EXPANSION OF WATER A relief valve that discharges periodically may be due to thermal expansion in a closed system. A water heater installed in a closed system, such as one with a backflow preventer or check valve installed in the cold water supply, shall be provided with means to control expansion. Contact the water supplier or local plumbing inspector on how to correct this situation. DO NOT plug or cap the relief valve. 8

9 discharge! CATHODIC PROTECTION Hydrogen gas can be produced in a hot water system that has not been used for a long period of time (generally two weeks or more). Hydrogen gas is extremely flammable. To prevent the possibility of injury under these conditions, we recommend the hot water faucet be open for several minutes at a sink close to the water heater before you use any electrical appliance which is connected to the hot water system. If hydrogen is present, there will be an unusual sound such as air escaping through the pipe as the hot water begins to flow. There should be no smoking or open flames near the faucet at the time it is open. ELECTRICAL CONNECTIONS All installation procedures involving electric power connection should only be performed by a trained, certified electrician. WARNING: WATER HEATER IS EQUIPPED FOR OPERATION ON ONE VOLTAGE ONLY. Check the rating plate on the front of the control panel access for the correct voltage and phase. DO NOT use this water heater with any other voltage other than the voltage specified on the rating plate. Failure to use the correct voltage can cause problems that can result in death, serious bodily injury or property damage. CAUTION: DO NOT CONNECT THE WATER HEATER TO AN IMPROPER SOURCE OF ELECTRICITY! The appliance, when installed, must be electrically grounded in accordance with the requirements of the authority having jurisdiction or in the absence of such requirements, with the latest edition of the National Electrical Code, NFPA No. 70. When the appliance is installed in Canada, it must conform to the CAE C22.1, Canadian Electrical Code, Part 1 and/or local Electrical Codes. HINGED DOOR TO ELECTRICAL COMPARTMENT ELECTRIC ACCESS FIG. 10 Electric Power Connections Electrical Control Panel Round Models 1. Use copper conductors only. All wiring between the appliance and field installed devices shall be made with copper wire suitable for at least 75 C (167 F) temperature rating. If the wiring from an old water heater installation was aluminum, replace the old wire with copper wire. 2. The factory internal wiring is attached to a terminal block inside the unit. The branch circuit is connected to the terminal block through an opening provided on the top of the water heater electrical access panel. ELECTRIC ACCESS HINGED DOOR TO ELECTRIC CONTROL COMPARTMENT FIG. 11 Electric Power Connections Electrical Control Panel Square Models 3. Line voltage wire exterior to the appliance must be enclosed in approved conduit or approved metal clad cable. 4. To avoid serious damage, DO NOT energize the appliance until the system is full of water. Ensure that all air is removed from the storage tank and piping before beginning 9

10 initial operation. Operation of a water heater without a completely filled tank may result in serious damage to the appliance and heating element burn out. 5. The water heater should be connected with a separate grounded branch circuit with over current protection and disconnect switch. The water heater should be grounded in accordance with national and local codes. A ground terminal is provided for ground connection only. 6. Provide the appliance with proper overload protection in the branch circuit. It is suggested that the electrician size the branch circuit at 125 percent of the heater ampere rating and further increase wire size as necessary to compensate for voltage drop in long runs. Branch circuit voltage drop should not exceed 3% at the heater. 7. Voltage applied to the heater should not vary more than +5% to -10% of the model and rating plate marking for satisfactory operation. 8. A wiring diagram is provided with the water heater for the electricians use. CAUTION: Never turn on the electric power or attempt to use this electric water heater unless it is completely full of water. Water must flow from the hot water faucet before turning electrical power ON. Operation of a water heater without a completely filled tank may result in serious damage to the appliance and heating element burn out JACKET ASSEMBLY Outer Jacket The outer jacket assembly is constructed from steel, galvanized on both sides. The galvanized surface is specially prepared and phosphate coated to allow application of a multiple coat enamel paint process. This coating process insures a long life from the jacket assembly. STANDARD EQUIPMENT Your commercial electric water heater is equipped with the following as standard equipment. Low watt density immersion heating elements with an incoloy sheath. Internal fusing of all elements in a maximum of 48 amp increments provides additional safety. Fuse cartridges are related at 1,000,000 amps interrupting capacity. A galvanized steel outer jacket and electrical control panel are provided. Channel iron skid base. Electrical control panel is provided with a hinged door and key lock. A glass lined steel tank constructed to ASME specifications and provided with magnesium anode(s). ASME rated temperature and pressure relief valve provided by factory to insure safe heater operation. Terminal block connections are installed by the factory for safe easy wiring connection. Manual reset high water temperature limit control. Immersion thermostat (one per 54kW of input as standard). 180 F (82.2 C) temperature operation is possible to provide water for sanitizing applications. Insulated to meet the latest edition of ASHRAE 90.1 energy efficiency standards. 3 year limited warranty provides protection against failure of tanks due to defects in material and workmanship in commercial application. Underwriter s Laboratories, Inc. listing for all models as a commercial electric water heater. 10

11 OPTIONAL EQUIPMENT COMPONENTS AND CONTROLS The following items are available as extra cost options. Electronic low water cut-off prevents energizing of the heater when it is not filled with water. TERMINAL BLOCK GROUND LUG Pilot lights Monitor on-off cycle of contactors. Manual limiting switches with indicating lights to permit heater kw input to be manually limited as desired. POWER CIRCUIT FUSE BLOCK CONTROL CIRCUIT FUSE BLOCK Temperature and pressure gauges are available installed flush with the jacket to monitor heater performance. IMMERSION THERMOSTAT TRANSFORMER Electronic step controller modulates power in-put and balances load to demand. Safety door interlock prevents opening of access door while heater is energized. Shunt trip disconnect provides power disconnect upon a control sensed malfunction. Alarm bell provides an audible alarm to warn of various control failures. LOW WATER CUTOFF (IF EQUIPPED) CONTACTOR (IF EQUIPPED) CONTROL CIRCUIT FUSE BLOCK FIG. 12 Electrical Panel Component Location Drawing TERMINAL BLOCK Time clock to control off-on cycles of the heater as programmed by the owner or electric utility requirements. Low water pressure switch. High water pressure switch. LOAD FIG. 13 Main Power Terminal Block LINE 11 A main power terminal block is provided for field connection of the branch power supply to the electric water heater. All internal power circuits to the immersion heating elements are connected to the load side of the main terminal block. The line side of the terminal block has individual lug type connections properly sized for the recommended copper field wire size.

12 FIG. 14 FUSE AND FLUE BLOCKS Fuse Block with Power Circuit Fuses The power to the immersion electric heating elements is switched by a definite purpose magnetic contactor. The contactor is supplied with 120 VAC from the control circuit when the immersion thermostat senses a drop in stored water temperature below the desired set point. A magnetic coil in the contactor is energized to complete the electrical circuit supplying power to the immersion heating elements. When the thermostat is satisfied, the contactor coil is deenergized and power to the heating elements is turned off. CONTROL CIRCUIT TRANSFORMER Each internal power circuit is fused for safety. Each power circuit to an immersion element is fused at a maximum of 48 amps. Power circuits may be fused at lower current levels as needed to balance current on three phase units. The power circuit fuses are held by a spring loaded fuse block rated for the voltage specified to operate the water heater. The control circuit is also fused on both the primary and secondary sides of the control circuit transformer. CONTACTORS FIG. 15 Magnetic Contactor FIG. 16 Control Circuit Transformer A transformer is used to reduce the line voltage to 120 VAC for internal control operation. The transformer is fused on both the primary and secondary side. The common side of the secondary control circuit is grounded. The VA rating of the control circuit transformer is based on the load of the various components in the water heater control circuit. WARNING: HAZARD OF ELECTRICAL SHOCK Before opening the electrical access panel to adjust the thermostat or servicing the water heater, make sure the electrical supply to the water heater is turned OFF. Failure to do this could result in death, serious bodily injury or property damage. 12

13 IMMERSION THERMOSTAT(S) DANGER: Full power is present whenever the cabinet door is opened, even with the pilot switch(es) turned off. Set temperature control to the lowest setting which satisfies the hot water requirements of the system. Lower water temperatures help minimize scale formation on the heating elements. See thermostat information below. For sequencer specifications, consult controller literature. WATER TEMPERATURE SETTINGS FIG. 17 Immersion Thermostat with Adjustment Knob This water heater uses an immersion thermostat(s) to activate magnetic contactors allowing current to flow to the immersion heating elements. The standard control system uses one immersion thermostat for each 54kW of electric heating power in a water heater. As an option, additional immersion thermostats may be provided to add additional steps of thermostatic control. The sensing bulb for each immersion thermostat is immersed in the stored water in the tank to provide quick, accurate response to changes in water temperature, The thermostat sensing bulb is located in the tank just above the elements it is controlling. The immersion thermostat set point is adjustable by rotating a knob on the control. Turning the knob counter clockwise decreases the temperature set point and turning the knob clockwise increases the set point. The temperature setting shown at the top of the knob is the selected set point. The immersion thermostat has a fixed 6 F (3.3 C) differential. TEMPERATURE REGULATION WARNING: HAZARD OF ELECTRICAL SHOCK Before opening the electrical access panel to adjust the thermostat make sure the electrical supply to the water heater is turned OFF. This water heater has an adjustable thermostat to control water temperature. The thermostat is factory pre-set at approximately 125 F (51.7 C) or less. Households with small children or invalids may require a 120 F (48.9 C) or lower temperature setting to reduce risk of scald injury. Some states may require a lower temperature setting. Check with your local codes or electric utility for local requirements governing the temperature setting. Remember, no water heating system will provide exact temperatures at all times. Allow a few days of operation at the setting to determine the correct temperature setting consistent with your needs. NOTE: (1) This water heater, when set at the lower temperature setting, is not capable of producing hot water of sufficient temperature for sanitizing purposes. (2) Higher stored water temperature increases the ability of the heater to supply desired quantities of hot water, however remember: CAUTION: Hotter water increases the risk of scald injury. Setting the temperature selector dial higher provides hotter water, which increases the risk of scald injury. 13

14 FIG. 18 HOT! DANGER BURN Water temperature over 125 F can cause severe burns instantly or death from scalds. Children, disabled and elderly are at highest risk of being scalded. See instruction manual before setting temperature at heating appliance. If this appliance is used to produce water that could scald if too hot, such as domestic hot water use, adjust the outlet control (limit) or use temperature limiting valves to obtain a maximum water temperature of 125 F. SEE MANUAL. WARNING: WARNING: SHOULD OVERHEATING OCCUR OR THE TEMPERATURE CONTROLS FAIL TO SHUT OFF,TURN OFF OR DISCONNECT THE ELECTRICAL SUPPLY AT THE MAIN POWER DISCONNECT EXTERNAL TO THE APPLIANCE. DANGER: Water temperature over 125 F (51.7 C) can cause severe burns instantly or death from scalding. Children, disabled and elderly are at highest risk of being scalded. TEMPERATURE ADJUSTMENT 1. Turn OFF the electrical power to the water heater. If the power disconnect point is out of sight, lock it in the open ( OFF ) position and tag to prevent unexpected application of power. 2. Open the water heater s electrical access panel. 3. Adjust each immersion thermostat to the desired temperature setting by turning the adjusting knob. Each thermostat will be factory pre-set to approximately 125 F (51.7 C) or less as shipped. 4. Close the water heater s electrical access panel. 5. Turn ON the electrical power to the water heater. CAUTION: The maximum temperature setpoint that should be set for the Immersion Thermostats or programmed into the Electronic Temperature Control Sequencer is 190 F ( 88 C) ELECTRONIC ELECTRONIC TEMPERATURE TEMPERATURE CONTROL CONTROL SEQUENCER SEQUENCER See instruction manual before setting temperature at heating appliance. Feel water before bathing or showering. If this appliance is used to produce water that could scald if too hot, such as domestic hot water use, adjust the outlet control (limit) or use temperature limiting valves to obtain a maximum water temperature of 125 F (51.7 C). Always close the electrical control panel door after making a temperature adjustment. Turn on electricity. FIG. 19 Electronic Temperature Control with Digital Display 14

15 The water heater uses an optional adjustable electronic temperature control to provide staged ON/OFF control of the electric heating elements. Operation is based on temperature input from an immersion temperature sensor. The sensor is a positive coefficient platinum thermistor. The sensor is placed in a well located above the heating elements it is controlling. A liquid crystal display is provided to indicate sensed temperature and operating parameters. The temperature control may operate in as many as four stages of control. For more stages of operation, multiple electronic temperature control sequencers are installed and wired to operate in series Access to the control is achieved by opening the hinges control panel door covering the electrical components. Four programming keys are provided to program set point and differential values for each stage and to control the display. The four keys are Select, Up arrow, Down arrow and Enter. Select Key - Sequentially prompts the user as to what parameter is being displayed: set point, differential, stage energized, operation mode (heat), indication of assigned stage (1,2,3). Once the last parameter value has been viewed, pressing the Select key will display the control values again from the beginning of the display loop. Up and Down Arrow Keys - Allow the displayed parameter to be increased or decreased. After pressing the Select key, a control value can be changed by using the Arrow keys. Control values will be increased or decreased by 1 F for each time the Arrow keys are depressed. Enter Key - Places the new value into the memory of the microprocessor. FIG. 20 Electronic Temperature Control Digital Display and Programming Keys SPECIFICATIONS Set Point Adjustment Range: Max setting 220 F (105 C). Temperature Accuracy: +/- 1 F. Display Resolution: 1 F via Liquid Crystal Display (LCD). Sensor: Thermistor 4.8 ohms/ F. Operating Humidity: 5-95% RH Noncondensing. Operating Ambient Temperature: -30 to 125 F. 15 IMPORTANT: A control value or operation will not be entered in the memory of the microprocessor until the Enter key is pressed. Control values and operation selection will remain in the device memory even after power is removed. Select and Enter Keys simultaneously pressed - Changes operation mode of the control from heat to cool mode. DO NOT CHANGE THIS SETTING. This control must always be in the HEAT position for proper operation of the water heater. When all stages have been programmed the display will revert back to sensed temperature and load energized status.

16 DISPLAY Once power is applied to the temperature controller the display will countdown from 210 until the display reads zero. All outputs are de-energized at this time. This countdown process will repeat each time main power is interrupted. To avoid viewing this entire countdown, press the Select key. The display will now show normal readings: load (sensed) temperature and stages energized. At any time during the programming procedure, the display will revert back to showing the sensed temperature and stage status indication 60 seconds after the last programming key is pushed. SETUP OF THE TEMPERATURE CONTROLLER Each stage on the controller has its own independent set point and differential which are determined by the programming keys. Each stage of heating is de-energized as the sensed temperature reaches the programmed set point. Each available stage of heating is energized as the sensed temperature reaches the set point minus the differential. EXAMPLE: Using stage one of the control as an example, the corresponding load would be energized and de-energized at the following temperatures based on the programmed settings. Settings Set point: 160 o F Differential: 8 o F Output Energized Stage One: Energized at 152 o F Output De-energized Stage One: De-energized at 160 o F point and differential the control will sequence both stages on and off with only a slight delay between switching of the stages. The control is normally programmed with a few degrees difference between the set point of each stage to sequence individual stages on as required by demand. This will allow input to be balanced to system demand. The exact settings will be determined by your system hot water requirements. Based on your system requirements, determine the set point and switching differential for each stage of operation and enter into the worksheet below. Programming Worksheet Stage 1: Set Point 1 Off at Differential 1 On at Stage 2: Set Point 2 Off at Differential 2 On at Stage 3: Set Point 3 Differential 3 Stage 4: Set Point 4 Differential 4 Off at On at Off at On at These values will be programmed into the temperature controller. Each available stage of operation must be programmed with a set point and a differential. If two stages are programmed with the same set 16

17 PROGRAMMING NOTE: When power is initially applied to a new water heater, the control points will be pre-programmed. The factory final quality test sets the unit for test firing. The preset values are as follows: Stage Set Point Differential F 2 F F 2 F F 2 F F 2 F Re-program the set points and differentials to meet your system hot water requirements. The operating control uses a Liquid Crystal Display for interactive prompting during programming and display of sensed and assigned set point and differential values. Programming is accomplished through the use of the four programming keys. TEMPERATURE ADJUSTMENT 1. Turn OFF the electrical power to the water heater. If the power disconnect point is out of sight, lock it in the open ( OFF ) position and tag to prevent unexpected application of power. 2. Open the water heater s electrical access panel. 3. Verify that the unit is properly applied and the model number on the rating plate correctly identifies the unit. 4. Turn the electrical power switch to the ON position. The control will begin counting down from 210. This countdown sequence will last for approximately 3-1/2 minutes. WARNING: HAZARD OF ELECTRICAL SHOCK Full power is present whenever the cabinet door is open and the main power disconnect is in the ON position, even with the pilot switch(es) turned off. 5. To override this time delay, press Select. 6. Press Select to display the current stage set point. 7. Press Up Arrow key to increase or Down Arrow key to decrease to the desired set point. 8. Press Enter to enter the displayed value into memory. 9. Press Select to display the current stage switching differential. 10. Press Up Arrow key to increase or Down Arrow key to decrease to the desired switching differential. 11. Press Enter to enter the displayed value into memory. 12. Repeat steps 6 through 11 to program each additional stage. 13. Press Select, Select, Select, Select (4 times) to return to stage 1 parameters. Scroll through the programming loop a second time to confirm that the appropriate values have been entered into memory by pressing Select. 14. Press Select after viewing the switching differential for the final stage to display stored water temperature. 15. Close the water heater s electrical access panel. 16. The temperature control is now ready for operation. 17

18 NOTE: The control values programmed into memory will not be lost because of a power failure. ERROR MESSAGES DISPLAYED BY THE ELECTRONIC TEMPERATURE CONTROL There are seven error messages that can be displayed in response to software or hardware problems with the boiler s internal electronic temperature control. The error codes that may be seen flashing on the display are: SF - Sensor Failure The display flashing SF indicates an out-of-range or defective sensor. Make sure sensors are properly installed, wired and connected to the control. Correct sensor installation or replace sensor. OE - ROM Error The internal ROM of the microprocessor in the boiler s electronic temperature control is defective. This error cannot be field repaired. Replace the water heater s electronic temperature control. AE - RAM Error The internal RAM of the microprocessor in the boiler s electronic temperature control is defective. This error cannot be field repaired. Replace the water heater s electronic temperature control. HIGH WATER TEMPERATURE LIMIT CONTROL EF- EEPROM Failure The values read form the EEPROM are not the same as the values written into the EEPROM. This error cannot be field repaired. Replace the water heater s electronic temperature control. CF - Calibration Failure The calibration resistor reading was not within the range of the Analog to Digital converter. This error cannot be field repaired. Replace the water heater s electronic temperature control. OF - Stray Interrupt Failure An unused interrupt occurred. This error cannot be field repaired. Replace the water heater s electronic temperature control. CE - Configuration Error The device hardware was configured to a nonexistent device. This error cannot be field repaired. Replace the water heater s electronic temperature control. FIG. 21 High Water Temperature Limit Control - Fixed Setting The unit is equipped with a fixed setting, manual reset high water temperature limit control. The water heater temperature limit control has a fixed limit setting of 195 F (90.6 C). If water temperature exceeds the limit set point, the limit will break the control circuit and shut down the unit. The limit control can only be reset after the water temperature has cooled below the set point of the limit. The high water temperature limit control is mounted on the surface of the tank, above the heating element installed at the highest point in the tank. The high limit control is reset by pushing the red reset button on the control. Operation of the limit control usually indicates a major problem with the thermostat, contactors or heating elements. Do not continue to push the 18

19 reset multiple times. The source of the problem must be found and corrected to insure proper operation. The limit control is covered with an insulation blanket which must be removed to push the red reset button. The blanket of insulation must be replaced before the power is turned on and the water heater is returned to service. CAUTION: Disconnect the main power to the heater before opening the element access panel to reset the high limit control. NOTE: The high limit control will not reset until the water temperature has dropped below the set point of the high limit. element blades are mounted on a single hex-head screw-in mounting flange. The element flange mounts into a 1 1/2 NPT threaded connection welded to the storage tank. The hex-head screwin mounting flange seals to the tank with an O ring gasket at the base of the threaded portion of the flange. The tank flange has a matching recess for the O ring gasket to insure a proper water tight seal.. The O ring element gasket must be replaced with a new gasket when an element is removed for inspection, cleaning or replacement. SAFETY DOOR INTERLOCK (Optional) IMMERSION HEATING ELEMENT FIG. 23 Safety Door Interlock FIG. 22 Immersion Heating Element WARNING: HAZARD OF ELECTRICAL SHOCK Before opening the access panel to remove or service the immersion heating elements, make sure the electrical supply to the water heater is turned OFF. Failure to do this could result in death, serious bodily injury or property damage. The heating input to this commercial electric water heater is provide by low watt density immersion heating elements. The heating elements are constructed from an incoloy sheath with a tin plate on the exterior surface. Three The optional safety door interlock is an electrically operated locking pawl that is energized when main power to the water heater is turned ON. The interlock is mounted to the inside of the electrical control panel door and extends behind a locking flange when energized. Main power may be turned off and the electrical access door may be opened for service. With the door open, main power may be energized if required to service or troubleshoot the operation of selected components. DANGER: HAZARD OF ELECTRICAL SHOCK Full power is present whenever the cabinet door is opened and main power is turned ON, even with the pilot switch(es) turned off. 19

20 LOW WATER CUTOFF (Optional) LED Control Board Probe FIG. 24 Electronic Low Water Cut-off Control This water heater may be equipped with an optional electronic low water cut-off installed at the factory. This low water cut-off device uses a water level sensing probe located above the heating element installed in the highest point in the storage tank. If the internal water level drops below this point, the low water cut-off will shut down operation of the heating elements. An electronic type low water cut-off is available as a factory supplied option on all models. The optional electronic low water cut-off has an LED located on the main circuit board. This LED will be illuminated and the control circuit will be completed between the common and normally open contacts on the circuit board when the sensing probe is below the water level in the storage tank. An optional manual reset function and test button is available on the electronic low water cut-off. The operation of a low water cutoff should be inspected every six months. LOW WATER PRESSURE SWITCH (Optional) A low water pressure switch is available as an option on this water heater. A water pressure switch is used to monitor the water pressure in the water heater storage tank. If the water pressure drops below an adjustable set point, the control circuit is opened and operation of the water heater is shut down. The low water pressure switch may be specified with either a auto-reset function or a manual reset function on low water pressure. HIGH WATER PRESSURE SWITCH (Optional) FIG. 26 High Water Pressure Switch A high water pressure switch is available as an option on this water heater. A water pressure switch is used to monitor the water pressure in the water heater storage tank. If the water pressure rises above an adjustable set point, the control circuit is opened and operation of the water heater is shut down. The low water pressure switch may be specified with either a auto-reset function or a manual reset function on high water pressure. MANUAL LIMITING SWITCHES (Optional) FIG. 25 Low Water Pressure Switch 20 As an option, a switch or multiple switches may be provided to interrupt the 120 VAC control circuit feed to the contactor coil or coils from the immersion heating thermostat(s). This switch may be used to manually turn off a portion of the heating element input. This feature may be used to reduce

21 electrical input of the water heater in the summer months when ground water temperatures are warmer and full electrical input from the immersion heating elements is not required. The water heater may be restored to full input by moving the switches to the ON position. TIME CLOCK (Optional) PILOT LIGHTS (Optional) The water heater may be provided with optional pilot lights to provide an external indicator for each contactor or stage of heating elements that is energized. Each pilot light is wired in parallel with the 120 VAC control circuit feed to the contactor coil(s). The pilot will be turned on as the contactor coil(s) is energized by the temperature controls. SHUNT TRIP DISCONNECT (Optional) FIG. 27 Time Clock The water heater may be provided with an optional time clock. The time clock will allow the water heater to be turned on and off with a pre-set schedule. The time clock may be specified with a 24 hour scheduling period or with a 7 day scheduling period. By the adjustment of the setpoints on the time clock, the water heater may be turned off when hot water is not needed or in periods when the building may not be occupied. The time clock allows the water heater to automatically cycle on in advance of the time when hot water may be needed. This will insure that hot water is always available yet save energy when there are scheduled periods when there will be no requirement for hot water. This feature is especially useful for schools and building that are occupied on a fixed schedule. As an additional feature, time clocks may be furnished with a spring wound carry-over function to insure that a switching schedule is maintained in periods where there may be power interruptions. The time clock works by making and breaking the 120 VAC control circuit to the contactor coils to shut down operation of the heating elements in the desired time periods. Shunt trip disconnect provides a power disconnect upon a control sensed malfunction via a circuit breaker installed in the main power supply to the water heater. The circuit breaker is shipped as a separate item that must be field installed. The water heater 120 VAC control circuit provides a feed to the circuit breaker that will shut down main power on either a low water level condition (if equipped) or high water temperature. Once the water heater is installed and all power is connected, the toggle switch that arms the shunt trip must be placed in the on position to provide the shunt trip function on the desired control sensed malfunction. FIG. 28 Alarm Bell ALARM BELL (Optional) 21

22 An alarm bell with silencing switch is available as an option on this water heater. The alarm bell can be used to provide an audible indication of a control sensed malfunction. The user must specify the safety function or multiple safety functions that the alarm bell will sound on when the water heater is ordered from the factory. The alarm bell typically is used to indicate a low water condition or a high water temperature condition. The alarm is furnished with a silencing switch to turn off the audible alarm while trouble shooting a control sensed malfunction that is indicated by an audible alarm. Once the control sensed malfunction is corrected, the silencing switch must be returned to the ON position to re-establish the audible alarm function. Never operate the heating elements without being certain the water heater is filled with water and a temperature and pressure relief valve is installed in the relief valve opening on top of the heater. The pilot switch(es) (if equipped) mounted on the control cabinet permit the heater to be turned on and off without having to operate the electrical disconnect switch. The pilot switch interrupts only the 120 VAC control circuit in the water heater. Full power is still present at the terminal block, fuses and contactors. DANGER: START-UP PROCEDURE Full power is present whenever the cabinet door is opened, even with the pilot switch(es) turned off. THERMAL EXPANSION OF WATER A relief valve that discharges periodically may be due to thermal expansion in a closed system. Many water systems are equipped with pressure reducing valves, check valves or back flow preventers which may cause the water system to be closed. As water is heated it will expand in volume due to thermal expansion. The system must make allowance for this expansion. If an expansion tank is not provided in the system, water pressure may increase to the point where 22 the water heater s temperature and pressure relief valve opens to relieve the excess pressure. The temperature and pressure relief valve is not intended for the constant relief of thermal expansion. This is an unacceptable condition and must be corrected. Do not plug or cap the relief valve discharge! A properly sized expansion tank is typically installed in the potable water system to relieve the pressure built up by thermal expansion of heated water. Consult your local plumbing contractor and plumbing wholesaler for assistance in properly selecting an expansion tank for your system. As the water heater operates, there may be noises generated by the expansion and contraction of the metal parts of the water heater and related piping. These noises may occur during periods of heat up or cool down. They do not represent harmful or dangerous conditions. FILLING THE WATER HEATER 1. Insure that the electrical power to the water heater is in the OFF position. If the power disconnect point is out of sight, lock it in the open ( OFF ) position and tag to prevent unexpected application of power. 2. Close the water heater drain valve(s). 3. Open a nearby hot water faucet to allow the air in the system to escape as the tank fills. 4. Fully open the cold water inlet valve to the water heater to begin filling the heater and piping. NOTE: The cold water supply must be left in the open position when the water heater is in use. 5. Check the nearby hot water faucet to verify that air is exiting the tank as it fills with water. Allow water to run until a constant flow is obtained at the faucet. This will insure that all air is purged from the system.

23 CAUTION: The power supply must remain off until the water heater and all related piping are completely filled with water to insure that there will not be a possible problem with heating element burn out. 6. While the tank is filling, open the electrical control panel and set the thermostat(s) to the desired water temperature. If equipped with multiple thermostats, all individual thermostats may be adjusted to the same temperature set point or they may be set a 2 F to 4 F (1 C to 2 C) apart to step the elements on in stages. 7. Insure that any pilot switches or manual limiting switches are placed in the ON position. 8. When a constant flow is obtained at the faucet, it may be turned off. The temperature and pressure relief valve should be manually opened to insure that there is no captive air in the storage tank. A constant stream of water must flow from the manually opened relief valve. Release the handle on the relief valve and allow it to close after water flow is observed. 9. Carefully check the tank, pipe and fittings for any sign of a water leak. Immediately repair as needed. Open the access door to the immersion heating elements and check for leaks at the element mounting flanges. If any leak is detected, tighten the screw in element. START-UP 10. Insure that the electrical access panel (field wiring compartment) is closed and the heating element access panel is in place before proceeding. 11. After assuring that the tank is completely filled with water and no leaks are detected, you are now ready to start operation of the water heater. 12. Turn on the electric power at the main disconnect point. The contactors should be energized as the elements start to heat the water in the tank As the water heater starts heating, check the contactors for buzzing or chattering during operation. If noise is detected, turn off main power, open the control panel and clean the contact points of the magnetic contactor(s). Remove any dust, dirt or foreign matter that may have found its way into the contactor or other electrical components in the control panel during shipping, installation or service. 14. Close the electrical control panel and turn on main power. 15. The water heater is now ready for normal operation. INITIAL START-UP CHECKS The following checks should be made by the installer when the water heater is placed into operation for the first time. WARNING: HAZARD OF ELECTRICAL SHOCK Before opening the access panel to perform service on any electrical component, make sure the electrical supply to the water heater is turned OFF. Failure to do this could result in death, serious bodily injury or property damage. 1. Allow the water heater to heat for approximately thirty minutes after following the filling and start up procedures. 2. Turn off the main electrical power to the water heater. If the power disconnect point is out of sight, lock it in the open ( OFF ) position and tag to prevent unexpected application of power. 3. Open the electrical control panel door and feel each wire connection and fuse clip for excessive temperature. If any connection is found to be excessively hot, check the tightness of the connection. Check all factory internal wiring connections and the field made main power connections for tightness.

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